Sight-feed for force-feed lubricators



B. H. SKELLY.

SIGHT FEED FOR FORCE FEED LUBRICATORS.

APPLICATION FILED MAR. 3|, 1920.

Patented Feb. 8, 1921.

Berna rZHS/reZjy.

UNlTEI) STATES PATENT OFFICE.

BERNARD H. SKELLY, OF BRIDGEPORT, CONNECTICUT.

SIGHT-FEED FOR FORCE-FEED LUBRICATORS.

Application filed. March 31, 1920.

as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to sight feeds for force :Eeed lubricators, but more particularly has reference to devices of this description known as the Blinker type, in which oil appears momentarily through the sight glass and simultaneously with the oil feed impulses.

Sight feeds of this type have heretofore been utilized, but the plunger or closure whlch 1S operated by the Oll impulses has been equlpped with an 011 duct extending therethrough and communicating directly with the outlet which leads to the parts to be lubricated, and while this sort of feed was admirably adapted for use in connection with the heavier oils, it does not operate satisfactorily when the lighter oils are used.

In these devices noted, the passage through the plunger or closure chokes back the feed of the heavier oils so that the plunger will be depressed and show a discoloration beneath the sight glass before the oil has had a chance to pass through the orifice in the plunger, but in the instance of the lighter oils the latter will pass through this orifice before the plunger has been depressed to any appreciable extent, and since these lighter oils possess less colorthan the heavier oils, the film of oil between the plunger and the sight glass will be so thin that the discolora tion is hardly if at all visible.

It the passage through the plunger be made smaller then it will so choke the feed of the heavier oils that a back pressure will be created and there will be no satisfactory delivery of the oil to the outlet although the lighter oils would probably show discoloration through the sight glass owing to greater depression of the plunger or closure.

It is the object of the present improvement to provide a sight feed which shall operate equally as well in connection with either the heavier oils or the lighter oils,

Specification of Letters Patent.

Patented Feb. 8, 1921.

Serial No. 370,063. 1

while at the same time added to this efficiency are simplicity and economy in construction. I Referring to the accompanying draw- 1ng:--

Figure l is a sectional elevation illustrating the preferred embodiment of my improvement- Fig. 2 a section at the line 2-2 of Fig. l, and

Fig. 3 a view similar to Fig. 1 but illustrating a modified form of my improvement.

Similar numerals of reference denote like parts in the several figures of the drawing.

1 is a caslng or main body portion, and 2, 3, are nipples extending from the casing and adapted to be connected respectively with the oil supply and oil distributing means, these nipples having oil passages 4 and 5.

In the main body portion of the casing is a recess 6 within which is a plunger or closure 7 which closely conforms to the walls of the recess but is capable of free reciprocatory movements. 8 is a coil spring confined beneath the plunger 7 and the bottom of the recess and serving to normally project the piunger.

9 is a by-pass leading from the passage 4 through the top face of the casing whi h lat ter is smooth and level so as to afford a proper seat for the purposes presently to be explained.

10 is a washer made of any suitable nonmetallic material and seated on the top face of the casing and provided with an opening 11 with which the by-pass 9 registers.

12 is a sight glass seated on the washer and confined by any suitable open cap 13 that is screwed to the casing.

' 1 is a lay-pass which leads from the outlet opening 5- in the casing and opens into the walbof the recess 6 at a point below the bottom of the sight glass 12, this by-pass being normally closed by the side wall of the plunger 7.

When the oil is driven through the inlet 4: and by-pass 9 it will force the plunger 7 downwardly until the outer face of the plunger shall have passed the mouth of the bypass 14, whereupon the oil will flow through said by-pass into the outlet passage 5. hen the pump impulses of the oil have ceased the spring 8 will return the plunger 7 to its normal position and thereby again close the by-pass 14..

it will thus be noted that the plunger 7 must be depressed a predetermined distance before the oil can escape to the outlet passage and this will insure the presence of a considerable body of oil between the sight glass and the top face of the plunger so that the oil will be easily discernible even though a very light grade of oil is used.

The washer 10 is used merely for the purpose of affording a cushion for the sight glass so that the latter will not become broken.

Referring to Fig. 3 I have shown the plunger formed with an oil passage 15 one end of which opens in the top face of the plunger while the other end opens at the side of the plunger, while a short by-pass 16 leads from the outlet passage 15 into the wall of the recess 6 at a predetermined distance below the oil passage 15 when the plunger is in its normal or projected position, so that it will be clear that no oil can pass into the outlet passage until the lower end of the passage 15 has passed beyond the by-pass 16, thus likewise insuring the presence of a considerable body of oil between the top face of the plunger and the sight glass.

While I have shown the outer face of the plunger 7 normally in contact with the sight glass, this is not at all necessary since such face may be normally spaced from the sight glass for it is impossible for the oil to be de livered into the outlet passage until the plunger has been depressed sufliciently to eX- pose the outlet by-pass.

The incoming end of the outlet by-pass may be located at any predetermined distance below the normal position of the top face of the plunger, according to the nature of the oil utilized, but in all instances the body of oil between the plunger and the sight glass will be sufficient to instantly determine whether or not the forced feed of oil is being properly effected.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is 1. A sight feed for force feed lubricators, comprising a casing having inlet and out let communications with the oil supply and the parts to be lubricated, a sight glass, a resilient plunger normally projected against the glass, and a by-pass leading to the outlet from a point below the relaxed outer face of said plunger and normally closed by the side of the latter.

2. A sight feed for a force feed lubricator, comprising a casing having an outlet and an inlet which respectively communicate with the oil supply and the parts to be lubricated and are capable of communication with each other, a recess in the casing, a seat in the casing surroundingthe mouth of the recess, an inlet by-pass terminating flush with said seat, a sight glass confined against said seat over said recess and normall closing said by-pass, a resiliently acting plunger which is normally projected into close contact with the sight glass, and an outlet by-pass which opens into said recess at a point below the bottom face of the sight glass.

3. A sight feed for force feed lubricators, comprising a casing having'inlet and out let communications respectively with the oil supply and the parts to be lubricated, a sight glass, and a resilient plunger normally projected toward the glass, the parts being so constructed and arranged that the oil supply to the outlet will be cut off until the plunger has been depressed by the oil pressure to a predetermined degree.

a. A. sight feed for force feed lul'n'icators, comprising a casing having inlet and outlet communications with the oil supply and the parts to be lubricated, a sight giass, a resiliently acting plunger in the casing immediately below said glass, an inlet by-pass leading to a point below said glass whereby oil under pressure will be forced between said glass and plunger to depress the latter, and an outlet lay-pass below the top face of the plunger in its relaxed position and always normally closed by the side of the plunger, whereby the outlet for the oil will be open only when the oil pressure shall have forced the top of the plunger beyond said outlet by-pass.

In testimony whereof I aifix my signature.

BERNARD H. SKELLY. 

